Generic (void *)int

[Maurizio Cimadamore]

Whohoo!

Looking forward to the feedback - and thanks for the patience!

Maurizio

On 18/02/2019 14:30, Giuseppe Barbieri wrote:
> Uh, sorry, my bad, you are right,
>
> ptr1.set(Vec3.lenght.L)
>
> should have been
>
> ptr1.set(Vec3.size.L)
>
> it works flawless! Thanks you all, guys
>
> I'll write later a list  with some feedbacks to smooth the experience for gl devs
>
>
> Il giorno lun 18 feb 2019 alle ore 15:27 Maurizio Cimadamore 
> <maurizio.cimadamore at oracle.com 
> <mailto:maurizio.cimadamore at oracle.com>> ha scritto:
>
>     Uhm - the code snippet for converting long into pointer is correct; I
>     checked this on my machine:
>
>     class Test {
>          public static void main(String[] args) throws Throwable {
>               try (Scope sc = Scope.globalScope().fork()) {
>                    var ptr1 = sc.allocate(NativeTypes.LONG);
>                    ptr1.set(42L);
>                    var p1 =
>     ptr1.cast(NativeTypes.VOID).cast(NativeTypes.VOID.pointer()).get();
>                    System.err.println(p1.addr());
>              }
>        }
>     }
>
>
>     And this prints 42 as expected.
>
>     Are you sure the problem is coming from that pointer, and not from
>     somewhere else?
>
>     Maurizio
>
>     On 18/02/2019 14:16, Giuseppe Barbieri wrote:
>     > I just had a chance to try, but that, unfortunately, doesnt seem
>     to work..
>     >
>     https://github.com/elect86/panama/blob/master/src/test/kotlin/hello-triangle.kt#L100-L102
>     >
>     > I get a black triangle (I shall get a colored one instead)
>     >
>     > I guess I get at least the vertex positions (the triangle,
>     although black,
>     > is there) because in my case `semantic.attr.POSITION` is luckily
>     zero,
>     > which is the same index where the attributes start from.
>     >
>     > Other ideas?
>     >
>     > Il giorno lun 18 feb 2019 alle ore 10:56 Jorn Vernee
>     <jbvernee at xs4all.nl <mailto:jbvernee at xs4all.nl>>
>     > ha scritto:
>     >
>     >> Hi Giuseppe,
>     >>
>     >> You should be able to use this trick:
>     >>
>     >>       long pointerValue = 12L; // e.g.
>     >>       Scope scope = Scope.newNativeScope; // or
>     Scope.globalScope().fork()
>     >> depending on which version you are
>     >>       Pointer<Long> ptr = scope.allocate(NativeTypes.UINT64);
>     >>       ptr.set(pointerValue);
>     >>       Pointer<?> result =
>     >> ptr.cast(NativeTypes.VOID).cast(NativeTypes.VOID.pointer()).get();
>     >>       // use 'result'
>     >>
>     >> Be aware that this does do an allocation of a 64 bit int, so
>     you might
>     >> want to reuse the allocated space if you create a lot of
>     pointers from
>     >> literals.
>     >>
>     >> Maybe in the future we can add an API for creating pointers
>     from long
>     >> literals directly.
>     >>
>     >> Jorn
>     >>
>     >> Giuseppe Barbieri schreef op 2019-02-18 10:44:
>     >>> Thanks Sundar,
>     >>>
>     >>> that works flawless for `(void *)0`
>     >>>
>     >>> But now I also would need a generic solution, for example:
>     >>>
>     >>> (void *)12
>     >>>
>     >>> There is a sill opengl call ( glVertexPointer ) requesting
>     explicitely
>     >>> that: https://stackoverflow.com/a/8283855/1047713
>     >>>
>     >>> Signature:
>     >>>
>     >>> void glVertexAttribPointer(int index, int size, int type, byte
>     >>> normalized, int stride, Pointer<?> pointer);
>     >>>
>     >>>
>     >>> is there actually a way?
>     >>>
>     >>>
>     >>>
>     >>>
>     >>>
>     >>>
>     >>> You can use Pointer.nullPointer() method.
>     >>>
>     >>> -Sundar
>     >>>
>     >>> On 18/02/19, 8:09 AM, Giuseppe Barbieri wrote:
>     >>>> Hi,
>     >>>>
>     >>>> I'm looking for a way to convert this:
>     >>>>
>     >>>> (void*)0
>     >>>>
>     >>>> in Java.
>     >>>>
>     >>>> I tried to allocate a pointer and set its value to 0, but it
>     didnt
>     >>>> work
>     >>>>
>     >>>> Any ideas, guys?
>     >>>>
>     >>>> Thanks in advance
>